The basic principles
Radiation safety follows three rules - time, distance, and shielding:
- Time: the less time someone spends close to you, the lower their exposure
- Distance: radiation drops sharply with distance (1 meter reduces it dramatically)
- Shielding: walls and water provide effective barriers
These principles guide all the specific recommendations below.
Specific guidance for the first 3–5 days
Around young children (under 12) and pregnant women
- Keep about 1 meter (3 feet) of distance most of the time
- Brief hugs and kisses are usually OK by day 2–3 - but limit duration
- Don't sit a child on your lap or sleep with them for the first 3–5 days
- Pregnant women: extra cautious; ideally a 2-meter gap for the first 3 days
Around adult family members
- Normal household contact is fine - passing in the hall, sharing meals at the table
- Sleep separately for the first 3 nights - twin beds in the same room are OK if needed
- Brief hugs are fine; extended close contact (sleeping together) is what to avoid
- Sexual contact: most teams recommend waiting 7 days; use barrier protection if earlier
Toilet and bathroom
- Use a separate toilet if your home has more than one - designated for the patient for 3–5 days
- Sit to urinate (yes, even if you don't usually) to minimize splash
- Flush twice after each use
- Wash hands thoroughly with soap after every visit
- Don't share towels or washcloths for 3–5 days
- Wipe down toilet seat after use
Laundry and dishes
- Wash your clothes separately from family laundry for the first 3 days (especially underwear)
- Dishes can be shared - radiation doesn't transfer through utensils after washing
Pets
- Generally fine to be around pets
- Avoid letting them sleep in your bed for the first 3 nights
- Don't let pets drink from your toilet (already a good rule in general)
What about visitors?
- Brief visits (under 30 min) at normal distance are usually fine after day 1
- Longer visits or anyone pregnant, with young children, or immunocompromised should wait until day 5–7
Travel
- Public transport: avoid long bus/train rides in the first 3 days; brief trips OK
- Driving: fine if you feel well - caregiver in front passenger seat OK
- Air travel: generally not recommended in first 1–2 weeks. Lu-177 may set off airport scanners for weeks; bring documentation from your treatment center.
When precautions end
- Day 5–7: most distance precautions ease
- Day 7–10: normal sleeping, hugging, and close contact resume
- Day 14: all routine precautions over
Each cycle restarts the clock - you'll follow the same precautions after every cycle.
Frequently asked questions
Can I hold my grandchild after a cycle?
Brief contact (a hug, a kiss on the cheek) by day 2–3 is generally fine. Holding them on your lap or sleeping near them in the first 3 nights is what to avoid. By day 7, normal contact resumes.
What if I live alone? Are these precautions necessary?
The toilet and laundry guidance still applies (to protect anyone who later uses your bathroom). Distance precautions are obviously simpler. Most patients living alone find this phase easier, not harder.
Can I be intimate with my partner?
Sexual activity is typically resumed after 7 days. If sooner, use barrier protection. Cuddling without close prolonged contact is fine after day 3. Sleeping in the same bed: not for the first 3 nights, then case-by-case.
Will I set off radiation detectors?
Yes, possibly - for weeks after each cycle. Airports, customs, and some hospital scanners can detect Lu-177. Always carry your treatment letter.
What if a child accidentally touches me or hugs me in the first 3 days?
Brief unplanned contact is not a meaningful risk. The guidance is about repeated or prolonged close contact, not single brief moments. Don't panic; just gently maintain distance going forward.
Can I attend a public event (concert, religious service)?
Brief attendance is generally fine after day 2–3. Avoid sitting close to anyone for hours in the first few days. Most patients return to public events by week 2.